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I have a similar "thud" sound from my car. I think mine is my exhaust piping hitting something, but yours is probably something else.
Do you have any aftermarket stuff (exhaust, suspension, etc) in the rear? Usually wierd noises like that happen after installing aftermarket parts and not with stock setups...
Throw a little brother, sister or cousin in the trunk, drive around and aske them to pinpoint where the sound is coming from.
No? Well, just an idea.
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Platinum Gold '98 200SX SE-R 17" Nippon Ver.5 AEM in/Tenzo R out Intake cam 17* Tein SS 336lb F+R w/pillowballs Progress rear sway bar Shigspeed LCA brace F/R strut bars H&R Trak+ Prothane/ES polys B&M SS/Nismo GT Ti JWT PP Stillen Type2 wing
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